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Question

Among the following, the narrow-spectrum antibiotic is-


A

Penicillin G

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B

Ampicillin

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C

Amoxicillin

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D

Chloramphenicol

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Solution

The correct option is A

Penicillin G


The correct option is A.

Explanation of correct option:

  1. The narrow-spectrum antibiotics act against a particular group of bacteria.
  2. Penicillin G is a narrow-spectrum antibiotic that specifically targets Gram-positive bacteria like pneumococci, streptococcus, and staphylococcus. They are unable to target Gram-negative bacteria.

Explanation of incorrect option:

Option B:

  1. Ampicillin belongs to the group of synthetic beta-lactams.
  2. It is broad-spectrum in its action and acts against both Gram-positive and negative bacteria.

Option C:

  1. Amoxicillin is produced as an amoxicillin trihydrate and is effective against both Gram-positive and negative bacteria.
  2. Thus it is a broad-spectrum antibiotic.

Option D:

  1. Chloramphenicol is effective against various microbes like bacteria, rickettsiae, mycoplasmas, etc.
  2. It is a broad-spectrum antibiotic.

Final answer: Penicillin G is a narrow-spectrum antibiotic.


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